RTOS Proxy driver port for STM32WB55

[LWChris]

I want to enable the RTOS Proxy in the debug launch configuration for my STM32CubeIDE project. However, in the "Driver settings" fieldset, I need to select a "Port" from a dropdown. The options in that dropdown confuse me. I have an STM32WB55, which to my knowledge is considered an MCU, not MPU, and it consists of an ARM Cortex M0 + ARM Cortex M4. My application is running on the M4, since M0 is dedicated to BLE.

The 3 dropdown options for M0/M4 are 1) "ARM_CM0", 2) "ARM_CM4F" and 3) "ARM_CM4_MPU" - but my code runs on M4, so 1) is probably not right, I don't use the STM32F-Series, so 2) is probably not right, and the WB55 is not an MPU, so 3) is probably not right either. I am certain that my naive interpretation of those cryptic port abbreviations is wrong for at least one of the options.

So - what is the right selection to make?

[LWChris]

Btw, from Try-and-Error "ARM_CM4F" appears to be the right option, since this gives a full callstack with function names. ARM_CM4_MPU only gives stack addresses, ARM_CM0 somewhat works, but for some tasks the callstack seems incomplete (e. g. entry function is missing).

[Semer CHERNI · Accepted solution]

Hello @LWChris​ 

First let me thank you for posting.

As you mentioned, ARM_CM4F is the right option in your case.

I want to add a small explanation about the "ARM_CM4_MPU" option. In this context MPU stand for Memory Protection Unit. Therefor this option is used if the memory protection unit is activated in your MCU.

Kind regards,

Semer.

[LWChris]

Hi @Semer CHERNI​,

thanks for the explanation. Can you also shed some light on what the "F" in "ARM_CM4F" stands for then?

[Piranha]

F means FPU.

https://en.wikipedia.org/wiki/ARM_Cortex-M#Cortex-M4